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| author | Joerg Roedel <joerg.roedel@amd.com> | 2009-09-03 15:01:43 +0200 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2009-09-03 15:55:34 +0200 |
| commit | a345b23b79f1900e7d87c3165182504419180de4 (patch) | |
| tree | 4dc0b858369520bc2125ba9bde9f388edc0777dd /arch/x86/kernel/amd_iommu.c | |
| parent | 93f1cc67cf3196174412adca87321b25c1c986b0 (diff) | |
| download | lwn-a345b23b79f1900e7d87c3165182504419180de4.tar.gz lwn-a345b23b79f1900e7d87c3165182504419180de4.zip | |
x86/amd-iommu: Reset command buffer on ILLEGAL_COMMAND_ERROR
On an ILLEGAL_COMMAND_ERROR the IOMMU stops executing
further commands. This patch changes the code to handle this
case better by resetting the command buffer in the IOMMU.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 2dc093370d2d..2333d615f5ee 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -61,6 +61,7 @@ static u64* alloc_pte(struct protection_domain *dom, static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, unsigned long start_page, unsigned int pages); +static void reset_iommu_command_buffer(struct amd_iommu *iommu); #ifndef BUS_NOTIFY_UNBOUND_DRIVER #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005 @@ -156,7 +157,7 @@ static void dump_command(unsigned long phys_addr) pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]); } -static void iommu_print_event(void *__evt) +static void iommu_print_event(struct amd_iommu *iommu, void *__evt) { u32 *event = __evt; int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK; @@ -195,6 +196,7 @@ static void iommu_print_event(void *__evt) break; case EVENT_TYPE_ILL_CMD: printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address); + reset_iommu_command_buffer(iommu); dump_command(address); break; case EVENT_TYPE_CMD_HARD_ERR: @@ -229,7 +231,7 @@ static void iommu_poll_events(struct amd_iommu *iommu) tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); while (head != tail) { - iommu_print_event(iommu->evt_buf + head); + iommu_print_event(iommu, iommu->evt_buf + head); head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size; } @@ -547,6 +549,15 @@ void amd_iommu_flush_all_devices(void) } } +static void reset_iommu_command_buffer(struct amd_iommu *iommu) +{ + pr_err("AMD-Vi: Resetting IOMMU command buffer\n"); + + amd_iommu_reset_cmd_buffer(iommu); + flush_all_devices_for_iommu(iommu); + flush_all_domains_on_iommu(iommu); +} + /**************************************************************************** * * The functions below are used the create the page table mappings for |